CN115716942A - Shock absorber top rubber material and preparation method thereof - Google Patents
Shock absorber top rubber material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a shock absorber top rubber material and a preparation method thereof, and belongs to the technical field of automobile accessories, wherein the shock absorber top rubber material comprises natural rubber, fluorosilicone rubber, fluoroether rubber, modified chloroprene rubber, modified nano-alumina, an anti-aging agent 4010NA, an anti-flexing agent SH, stearic acid, zinc oxide, carbon black N330, white carbon black, an auxiliary crosslinking agent and triethoxy vinylsilane; the modified nano-alumina is contained in the shock absorber top rubber material, the nano-alumina is beneficial to increasing the wear resistance and the heat conductivity of the top rubber material, the grafting treatment of a silane coupling agent is facilitated after the poly-dopamine coating, the compatibility of the modified nano-alumina and a base material is improved, the heat conductivity of the shock absorber top rubber material can be improved, the contact thermal resistance is effectively reduced, the heat generated in the working process of the shock absorber can be effectively conducted, the properties of hardness and the like of all parts of the shock absorber top rubber material are kept consistent, and the overall elasticity of the shock absorber top rubber is improved, so that the shock absorption effect is improved.
Description
Technical Field
The invention belongs to the technical field of automobile parts, and particularly relates to a shock absorber top rubber material and a preparation method thereof.
Background
The shock absorber can suppress the shock when the spring rebounds after absorbing shock and the impact from the road surface, and is widely applied to the automobile industry. Parts of the shock absorber can rub against each other and are easy to wear, so that the top rubber has an important function as a spring base at the top of the shock absorber assembly. The molecular chain movement can be hindered by the interaction between the molecules of the shock absorber jacking material, the stress and the strain of the shock absorber jacking material are often in an unbalanced state, and the shock absorber jacking material has a strong viscoelastic damping characteristic, so that the shock absorber jacking material can reduce the impact force of the shock absorber during working, and plays roles in buffering, shock absorption and sound insulation.
The patent with the publication number of CN107383474A discloses rubber for preparing shock absorber top rubber, the oil resistance, heat resistance and wear resistance of the rubber are improved through blending of multiple components, but different environments for automobile use have higher requirements on the performance of the shock absorber top rubber, the shock absorber top rubber can be hardened in a cold environment, uneven temperature of each part of the shock absorber top rubber can be caused due to uneven heat conduction generated in the working process of the shock absorber, differences can be generated in the performances of the hardness and the like of the top rubber, the flex tearing of the top rubber can be easily caused, and the service life of the shock absorber top rubber is influenced. In order to improve the heat conduction performance of the shock absorber top rubber, a shock absorber top rubber material and a preparation method thereof are provided.
Disclosure of Invention
The invention aims to provide a shock absorber top rubber material and a preparation method thereof, and aims to solve the problems in the background art.
The purpose of the invention can be realized by the following technical scheme:
a shock absorber top rubber material comprises the following raw materials in parts by mass:
40-60 parts of natural rubber, 5-10 parts of fluorosilicone rubber, 6-8 parts of fluoroether rubber, 50-70 parts of modified chloroprene rubber, 20-30 parts of modified nano alumina, 2-6 parts of anti-aging agent 4010NA, 2-3 parts of anti-flexing agent SH, 3-8 parts of stearic acid, 3-4.5 parts of zinc oxide, 20-25 parts of carbon black N330, 18-25 parts of white carbon black, 2-5 parts of an auxiliary crosslinking agent and 1-2 parts of triethoxyvinylsilane.
Further, the auxiliary crosslinking agent is any one of triallylisocyanurate and 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane.
Further, the modified nano-alumina is prepared by the following steps:
the method comprises the following steps: adding nano-alumina into a flask, adding an ethanol solution with the mass fraction of 25% and a Tris buffer solution with the concentration of 0.1mol/L into the flask, adjusting the pH value to 7.5-8 by hydrochloric acid, ultrasonically dispersing for 2-3h, then adding dopamine hydrochloride into the flask, stirring for 20-24h at the temperature of 60-65 ℃ to enable the dopamine hydrochloride to generate self-polymerization on the surface of the nano-alumina, centrifuging and suction-filtering a reaction solution after the reaction is finished, washing a filter cake for 3-5 times by absolute ethyl alcohol, vacuum-drying and crushing the washed filter cake to obtain dopamine-coated nano-alumina;
step two: adding a silane coupling agent KH-550 and an ethanol solution with the mass fraction of 90-95% into a flask, stirring and mixing, ultrasonically dispersing for 1-2h, adjusting the pH value to 4.5-5.5 with hydrochloric acid, then adding dopamine-coated nano alumina into the flask, stirring for 6-8h at the temperature of 60 ℃, centrifuging, performing suction filtration, washing a filter cake with deionized water for 2-3 times, performing vacuum drying on the washed filter cake, and crushing to obtain the modified nano alumina.
Further, in the first step, the dosage ratio of the nano-alumina to the ethanol solution to the Tris buffer solution to the dopamine hydrochloride is 20g:400mL:3mL of: 600mg.
Further, in the second step, the dosage ratio of the silane coupling agent KH-550 to the ethanol solution to the dopamine-coated nano alumina is 0.1-0.2g:100-150mL:20g.
Further, the modified chloroprene rubber is prepared by the following steps:
adding reduced graphene oxide and toluene into a flask, and performing ultrasonic dispersion for 2-3h at 50-70 ℃ to obtain a reduced graphene oxide dispersion liquid; dissolving chloroprene rubber with toluene at normal temperature to obtain chloroprene rubber solution; stirring and mixing the reduced graphene oxide dispersion liquid and the chloroprene rubber liquid, performing ultrasonic dispersion for 3-4h to obtain a mixed liquid, performing vacuum drying on the mixed liquid at the temperature of 110-120 ℃ for 12-16h, and completely evaporating toluene to obtain modified chloroprene rubber;
further, the dosage ratio of the reduced graphene oxide to the toluene in the reduced graphene oxide dispersion liquid is 0.8-1g:200mL.
Further, the dosage ratio of the chloroprene rubber and the toluene in the chloroprene rubber solution is 1g:8mL.
Further, the dosage ratio of the reduced graphene oxide dispersion liquid to the chloroprene rubber liquid is 1mL:4mL.
A preparation method of a shock absorber top rubber material comprises the following steps:
step S1: putting natural rubber, fluorosilicone rubber, fluoroether rubber and modified nano-alumina into an internal mixer, mixing for 50-60s under the conditions that the roll temperature is 30-40 ℃ and the rotor speed is 50r/min, then adding an anti-aging agent 4010NA, an anti-flexing agent SH, stearic acid and carbon black N330, continuously mixing for 180-200s, then discharging rubber at 140-150 ℃, and cooling after sheet discharge to obtain a rubber compound;
step S2: adding the first-stage rubber compound, the modified chloroprene rubber, the zinc oxide and the white carbon black into an internal mixer, mixing for 180-200s under the condition that the rotor speed is 50/min, discharging rubber at 140-150 ℃, and cooling after sheet discharge to obtain a second-stage rubber compound;
and step S3: adding the second-stage mixing rubber and the auxiliary crosslinking agent into an internal mixer, spraying triethoxyvinylsilane on the surface of the second-stage mixing rubber, mixing for 120-150s at the rotor speed of 20r/min, discharging rubber at the temperature of 60-80 ℃, and cooling after sheet discharge to obtain the shock absorber top rubber material.
The invention has the beneficial effects that:
the shock absorber top rubber material contains the modified nano aluminum oxide, the nano aluminum oxide is beneficial to increasing the wear resistance and the heat conductivity of the top rubber material, the cost is controllable, the poly dopamine coated grafting treatment of a silane coupling agent is facilitated, the silane coupling agent treatment enables the surface free energy of inorganic powder to be reduced, the agglomeration is reduced, the compatibility of the modified nano aluminum oxide and a rubber matrix material is improved, the uniform distribution of the modified nano aluminum oxide and the overlapping passage of the nano aluminum oxide are facilitated, the heat conductivity of the shock absorber top rubber material can be improved, the contact heat resistance can be effectively reduced, heat generated in the working process of the shock absorber can be effectively conducted, the consistency of properties such as hardness of the shock absorber top rubber material is facilitated, and the elasticity of the whole shock absorber top rubber is improved, so that the shock absorption effect is improved.
The modified chloroprene rubber is prepared by the reduced graphene oxide and the chloroprene rubber in a solution blending mode, so that the blending effect of the reduced graphene oxide and the chloroprene rubber is increased; the modified chloroprene rubber is favorable for increasing the thermal stability of the top rubber material of the shock absorber, the reduced graphene oxide can improve the stress dispersion effect of the top rubber material of the shock absorber through the adsorption interface of the reduced graphene oxide, the impact of other parts of the shock absorber on the top rubber of the shock absorber in the working process is relieved, the generation of cracks is reduced, and the wear resistance and the tensile strength of the top rubber material of the shock absorber are increased. The addition of the fluorosilicone rubber and the fluoroether rubber is beneficial to increasing the low-temperature resistance of the shock absorber top rubber material, the triethoxyvinylsilane is beneficial to increasing the viscosity of the shock absorber top rubber material, and the vinyl functional group of the triethoxyvinylsilane can improve the vulcanization activity, so that the prepared rubber shock absorber top rubber material is uniformly vulcanized, and the stability of the shock absorber top rubber material is further improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The preparation of the modified nano-alumina comprises the following steps:
the method comprises the following steps: adding 2kg of nano-alumina into a flask, adding 40L of an ethanol solution with the mass fraction of 25% and 300mL of Tris buffer solution with the concentration of 0.1mol/L into the flask, adjusting the pH value to 7.5 by using hydrochloric acid, ultrasonically dispersing for 2h, then adding 60g of dopamine hydrochloride into the flask, stirring for 20h at the temperature of 60 ℃ to enable the dopamine hydrochloride to generate self-polymerization on the surface of the nano-alumina, centrifuging and filtering reaction liquid after the reaction is finished, washing a filter cake for 3 times by using absolute ethyl alcohol, drying and crushing the washed filter cake in vacuum to obtain dopamine-coated nano-alumina;
step two: adding 10g of silane coupling agent KH-550 and 10L of 90% ethanol solution into a flask, stirring and mixing, ultrasonically dispersing for 1h, adjusting the pH value to 4.5 by using hydrochloric acid, then adding 2kg of dopamine-coated nano alumina into the flask, stirring for 6h at the temperature of 60 ℃, centrifuging, performing suction filtration, washing a filter cake with deionized water for 2 times, performing vacuum drying on the washed filter cake, and crushing to obtain the modified nano alumina.
Example 2
The preparation of the modified nano-alumina comprises the following steps:
the method comprises the following steps: adding 2kg of nano-alumina into a flask, adding 40L of an ethanol solution with the mass fraction of 25% and 300mL of a Tris buffer solution with the concentration of 0.1mol/L into the flask, adjusting the pH value to 7.8 by using hydrochloric acid, ultrasonically dispersing for 2.5h, then adding 60g of dopamine hydrochloride into the flask, stirring for 22h at 62 ℃, enabling the dopamine hydrochloride to generate self-polymerization on the surface of the nano-alumina, centrifuging and filtering a reaction solution after the reaction is finished, washing a filter cake for 4 times by using absolute ethyl alcohol, drying and crushing the washed filter cake in vacuum to obtain dopamine-coated nano-alumina;
step two: adding 15g of silane coupling agent KH-550 and 12L of 92 mass percent ethanol solution into a flask, stirring and mixing, ultrasonically dispersing for 1.5h, adjusting the pH value to 5 by using hydrochloric acid, then adding 2kg of dopamine-coated nano alumina into the flask, stirring for 7h at the temperature of 60 ℃, centrifuging, performing suction filtration, washing a filter cake by using deionized water for 2.5 times, performing vacuum drying on the washed filter cake, and crushing to obtain the modified nano alumina.
Example 3
The preparation of the modified nano-alumina comprises the following steps:
the method comprises the following steps: adding 2kg of nano-alumina into a flask, adding 40L of an ethanol solution with the mass fraction of 25% and 300mL of Tris buffer solution with the concentration of 0.1mol/L into the flask, adjusting the pH value to 8 with hydrochloric acid, ultrasonically dispersing for 3h, then adding 60g of dopamine hydrochloride into the flask, stirring for 24h at 65 ℃ to enable the dopamine hydrochloride to generate self-polymerization on the surface of the nano-alumina, centrifuging and suction-filtering a reaction solution after the reaction is finished, washing a filter cake for 5 times with absolute ethanol, vacuum-drying and crushing the washed filter cake to obtain dopamine-coated nano-alumina;
step two: adding 20g of silane coupling agent KH-550 and 15L of ethanol solution with the mass fraction of 95% into a flask, stirring and mixing, adjusting the pH value to 5.5 by using hydrochloric acid after ultrasonic dispersion for 2 hours, then adding 2kg of dopamine coated nano-alumina into the flask, stirring for 8 hours at the temperature of 60 ℃, centrifuging, performing suction filtration, washing a filter cake for 3 times by using deionized water, performing vacuum drying on the washed filter cake, and crushing to obtain the modified nano-alumina.
Example 4
The preparation method of the shock absorber top rubber material comprises the following steps:
step S1: adding 80g of reduced graphene oxide and 20L of toluene into a flask, and performing ultrasonic dispersion for 2 hours at the temperature of 50 ℃ to obtain a reduced graphene oxide dispersion liquid; dissolving 10kg of chloroprene rubber with 80L of toluene at normal temperature to obtain chloroprene rubber liquid; stirring and mixing 20L of reduced graphene oxide dispersion liquid and 80L of chloroprene rubber liquid, performing ultrasonic dispersion for 3h to obtain a mixed liquid, performing vacuum drying on the mixed liquid at the temperature of 110 ℃ for 12h, completely evaporating and removing methylbenzene, and recovering to obtain modified chloroprene rubber;
step S2: 2kg of natural rubber, 0.25kg of fluorosilicone rubber, 0.3kg of fluoroether rubber and 1kg of modified nano alumina prepared in example 1 are put into an internal mixer, and are mixed for 50s under the conditions that the roller temperature is 30 ℃ and the rotor speed is 50r/min, then 0.1kg of anti-aging agent 4010NA, 0.1kg of anti-flexing agent SH, 0.15kg of stearic acid and 1kg of carbon black N330 are added for continuously mixing for 180s, then rubber is discharged at the temperature of 140 ℃, and the mixture is cooled after being taken out, so that a first-stage mixed rubber is obtained;
and step S3: adding the first-stage rubber compound in the last step, 2.5kg of the modified chloroprene rubber prepared in the step S1, 0.15kg of zinc oxide and 1kg of white carbon black into an internal mixer, mixing for 180S under the condition that the rotor speed is 50/min, discharging rubber at 140 ℃, and cooling after sheet discharge to obtain a second-stage rubber compound;
and step S4: and adding the two-stage mixing rubber in the previous step and 0.1kg of triallyl isocyanurate into an internal mixer, then spraying 0.05kg of triethoxyvinylsilane on the surface of the two-stage mixing rubber, mixing for 120s under the condition that the rotor speed is 20r/min, discharging rubber at the temperature of 60 ℃, and cooling after sheet discharge to obtain the top rubber material of the shock absorber.
Example 5
The preparation method of the shock absorber top rubber material comprises the following steps:
step S1: adding 90g of reduced graphene oxide and 20L of toluene into a flask, and ultrasonically dispersing for 2.5h at the temperature of 60 ℃ to obtain a reduced graphene oxide dispersion liquid; dissolving 10kg of chloroprene rubber with 80L of toluene at normal temperature to obtain chloroprene rubber liquid; stirring and mixing 20L of reduced graphene oxide dispersion liquid and 80L of chloroprene rubber liquid, performing ultrasonic dispersion for 3.5 hours to obtain a mixed liquid, performing vacuum drying on the mixed liquid at the temperature of 115 ℃ for 14 hours, completely evaporating and removing methylbenzene, and recovering to obtain modified chloroprene rubber;
step S2: putting 2.5kg of natural rubber, 0.35kg of fluorosilicone rubber, 0.35kg of fluoroether rubber and 1.25kg of modified nano alumina prepared in the embodiment 2 into an internal mixer, mixing for 55s under the conditions that the roll temperature is 35 ℃ and the rotor speed is 50r/min, then adding 0.2kg of anti-aging agent 4010NA, 0.125kg of anti-flexing agent SH, 0.25kg of stearic acid and 1.1kg of carbon black N330, continuously mixing for 190s, discharging rubber at 145 ℃, and cooling after sheet discharge to obtain a first-stage rubber mixture;
and step S3: adding the first-stage rubber compound in the last step, 3kg of the modified chloroprene rubber prepared in the step S1, 0.2kg of zinc oxide and 1.2kg of white carbon black into an internal mixer, mixing for 190S at the rotor speed of 50/min, discharging rubber at 145 ℃, and cooling after sheet discharge to obtain a second-stage rubber compound;
and step S4: adding the two-stage mixing rubber in the previous step and 0.2kg of 2, 5-dimethyl-2,5-di (tert-butylperoxy) hexane into an internal mixer, then spraying 0.08kg of triethoxyvinylsilane on the surface of the two-stage mixing rubber, mixing for 135s under the condition that the rotor speed is 20r/min, discharging rubber under the condition of 70 ℃, discharging the rubber, and cooling after discharging to obtain the top rubber material of the shock absorber.
Example 6
The preparation method of the shock absorber top rubber material comprises the following steps:
step S1: adding 100g of reduced graphene oxide and 20L of toluene into a flask, and performing ultrasonic dispersion for 3 hours at 70 ℃ to obtain a reduced graphene oxide dispersion liquid; dissolving 10kg of chloroprene rubber with 80L of toluene at normal temperature to obtain chloroprene rubber liquid; stirring and mixing 20L of reduced graphene oxide dispersion liquid and 80L of chloroprene rubber liquid, performing ultrasonic dispersion for 4 hours to obtain a mixed liquid, performing vacuum drying on the mixed liquid at 120 ℃ for 16 hours, completely evaporating and removing methylbenzene, and recovering to obtain modified chloroprene rubber;
step S2: putting 3kg of natural rubber, 0.5kg of fluorosilicone rubber, 0.4kg of fluoroether rubber and 1.5kg of modified nano alumina prepared in example 3 into an internal mixer, mixing for 60s under the conditions that the roll temperature is 40 ℃ and the rotor speed is 50r/min, then adding 0.3kg of anti-aging agent 4010NA, 0.15kg of anti-flexing agent SH, 0.4kg of stearic acid and 1.25kg of carbon black N330, continuously mixing for 200s, discharging rubber at 150 ℃, and cooling after sheet discharge to obtain a first-stage rubber compound;
and step S3: adding the first-stage rubber compound in the last step, 3.5kg of the modified chloroprene rubber prepared in the step S1, 0.225kg of zinc oxide and 1.25kg of white carbon black into an internal mixer, mixing for 200S under the condition that the rotor speed is 50/min, discharging rubber at 150 ℃, and cooling after sheet discharge to obtain a second-stage rubber compound;
and step S4: adding the two-stage mixing rubber in the previous step and 0.25kg of 2, 5-dimethyl-2,5-di (tert-butylperoxy) hexane into an internal mixer, then spraying 0.1kg of triethoxyvinylsilane on the surface of the two-stage mixing rubber, mixing for 150s under the condition that the rotor speed is 20r/min, discharging rubber under the condition of 80 ℃, discharging the rubber, and cooling after discharging to obtain the top rubber material of the shock absorber.
Comparative example 1:
on the basis of example 6, the modified nano alumina in example 3 is not used, and the nano alumina with the same mass is directly used for preparing a first-stage rubber compound, and then the subsequent steps are kept unchanged to prepare a top rubber material.
Comparative example 2:
on the basis of example 6, instead of modifying the chloroprene rubber according to the method of step S1, a top-coat material was prepared by using the same quality of chloroprene rubber as it was, while keeping the remaining steps unchanged.
Comparative example 3:
on the basis of the embodiment 6, the reduced graphene oxide and the chloroprene rubber in the same proportion are directly blended to prepare the modified chloroprene rubber, and then the top rubber material is prepared according to the same subsequent steps.
The performance tests of examples 4-6 and comparative examples 1-3 were carried out, and the top rubber materials of each group were prepared into test specimens with a thickness of 15mm as required, and then vulcanized for 10min at 160 ℃ and 10MPa and for 10min at 180 ℃ and 10MPa in a two-stage vulcanization manner. Testing the tensile strength, 100% stress at definite elongation, tensile set and elongation at break of different samples according to GB/T528-2009; and testing the tear strength of different samples according to GB/T529-2008, and testing the heat conductivity of different samples by using a Hot-disk heat conductivity tester.
The results are shown in table 1:
TABLE 1
| Item | Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Tensile strength/MPa | 14.5 | 14.6 | 14.6 | 12.3 | 11.8 | 12.5 |
| 100% stress at definite elongation/MPa | 3.3 | 3.3 | 3.4 | 3.1 | 2.7 | 3.2 |
| Tensile set/%) | 17 | 17 | 17 | 16 | 18 | 17 |
| Elongation at break/%) | 310 | 309 | 311 | 257 | 279 | 304 |
| Tear Strength/kN.m -1 | 48.7 | 49.2 | 49.2 | 38.7 | 40.3 | 45.8 |
| Thermal conductivity/W (m.K) -1 | 1.24 | 1.25 | 1.25 | 0.62 | 0.98 | 1.06 |
As can be seen from table 1, the shock absorber topcoats prepared in examples 4 to 6 have better thermal conductivity and higher tensile strength than those of comparative examples 1 to 3.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The shock absorber top rubber material is characterized by comprising the following raw materials in parts by mass:
40-60 parts of natural rubber, 5-10 parts of fluorosilicone rubber, 6-8 parts of fluoroether rubber, 50-70 parts of modified chloroprene rubber, 20-30 parts of modified nano alumina, 2-6 parts of anti-aging agent 4010NA, 2-3 parts of anti-flexing agent SH, 3-8 parts of stearic acid, 3-4.5 parts of zinc oxide, 20-25 parts of carbon black N330, 18-25 parts of white carbon black, 2-5 parts of an auxiliary crosslinking agent and 1-2 parts of triethoxyvinylsilane;
the modified nano-alumina is prepared by the following steps:
the method comprises the following steps: adding nano-alumina, an ethanol solution and a Tris buffer solution into a flask, regulating the pH value to 7.5-8 by hydrochloric acid, ultrasonically dispersing for 2-3h, then adding dopamine hydrochloride into the flask, stirring for 20-24h at the temperature of 60-65 ℃, centrifuging, performing suction filtration, washing a filter cake, drying, and crushing to obtain dopamine-coated nano-alumina;
step two: adding a silane coupling agent KH-550 and an ethanol solution into a flask, stirring and mixing, ultrasonically dispersing for 1-2h, adjusting the pH value to 4.5-5.5 by using hydrochloric acid, then adding dopamine-coated nano alumina into the flask, stirring for 6-8h at the temperature of 60 ℃, centrifuging, suction filtering, washing a filter cake, drying and crushing to obtain the modified nano alumina.
2. The shock absorber apex material of claim 1, wherein the auxiliary crosslinking agent is any one of triallylisocyanurate and 2,5-dimethyl-2,5-di (t-butylperoxy) hexane.
3. The shock absorber superstock material according to claim 1, wherein the dosage ratio of the nano alumina to the ethanol solution to the Tris buffer solution to the dopamine hydrochloride in the first step is 20g:400mL:3mL of: 600mg.
4. The shock absorber apex material of claim 1, wherein in the second step, the dosage ratio of the silane coupling agent KH-550, the ethanol solution and the dopamine-coated nano alumina is 0.1-0.2g:100-150mL:20g.
5. The shock absorber apex material of claim 1, wherein the modified neoprene is prepared by the steps of:
carrying out ultrasonic dispersion on the reduced graphene oxide by using toluene to obtain a reduced graphene oxide dispersion liquid; dissolving chloroprene rubber with toluene to obtain chloroprene rubber liquid; stirring and mixing the reduced graphene oxide dispersion liquid and the chloroprene rubber liquid, performing ultrasonic dispersion for 3-4h to obtain a mixed liquid, and performing vacuum drying on the mixed liquid at the temperature of 110-120 ℃ for 12-16h to obtain the modified chloroprene rubber.
6. The shock absorber apex material of claim 5, wherein the amount ratio of the reduced graphene oxide to the toluene in the reduced graphene oxide dispersion is 0.8-1g:200mL.
7. The shock absorber top rubber material as set forth in claim 5, wherein the chloroprene rubber solution comprises chloroprene rubber and toluene in an amount ratio of 1g:8mL.
8. The shock absorber apex material of claim 5, wherein the usage ratio of the reduced graphene oxide dispersion to the chloroprene rubber solution is 1mL:4mL.
9. The preparation method of the shock absorber apex material according to claim 1, characterized by comprising the following steps:
step S1: putting natural rubber, fluorosilicone rubber, fluoroether rubber and modified nano-alumina into an internal mixer, mixing for 50-60s under the conditions that the roll temperature is 30-40 ℃ and the rotor speed is 50r/min, then adding an anti-aging agent 4010NA, an anti-flexing agent SH, stearic acid and carbon black N330, continuously mixing for 180-200s, discharging rubber at 140-150 ℃, discharging sheets and cooling to obtain a first-stage rubber compound;
step S2: adding the first-stage rubber compound, the modified chloroprene rubber, the zinc oxide and the white carbon black into an internal mixer, mixing for 180-200s under the condition that the rotor speed is 50/min, discharging rubber at 140-150 ℃, and cooling after sheet discharge to obtain a second-stage rubber compound;
and step S3: adding the two-stage mixing rubber and the auxiliary crosslinking agent into an internal mixer, spraying triethoxyvinylsilane on the surface of the two-stage mixing rubber, mixing for 120-150s under the condition that the rotor speed is 20r/min, discharging rubber at the temperature of 60-80 ℃, and cooling after sheet discharge to obtain the top rubber material of the shock absorber.
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